Prestack time migration method and device
A pre-stack time migration and space technology, applied in the field of seismic exploration, can solve problems such as no solution and inappropriateness, and achieve the effect of simple and efficient completion
Active Publication Date: 2018-06-01
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
[0004] However, if you want to shorten the processing cycle to improve the calculation efficiency of prestack time migration, it is obviously inappropriate to rely only on increasing the number of CPU cores and computing nodes
[0005]
For the above problems, no effective solutions have been proposed so far
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[0045] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0046] The inventor considers that coprocessors such as GPU can be used to improve performance, and utilize the energy efficiency advantages of heterogeneous systems to reduce operating costs. The basic idea of 3D Kirchhoff integration migration is the diffraction stacking method widely used in seismic exploration in the 1960s. The 3D Kirchhoff integration migration can be expressed by the following formula:
[0047]
[0048] in, R represents the ground point (x 0 ,y 0 ,z 0 =0) to the underground point (x, y, z), v represents the propagation velocity of the seismic wave.
[0049] In ...
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The present invention provides a pre-stack time migration method and device. The method comprises: mapping the seismic data to be migrated to a five-dimensional coordinate space, wherein the dimension corresponding to the five-dimensional coordinate space includes the CMP line size, the CMP, the recording time, the geophone offset and the direction angle; breaking down the seismic data to be migrated which is mapped to the five-dimensional coordinate space along two dimensions including the geophone offset and the direction angle, and obtaining M OVT slice data; dividing the M OVT slice data into N OVT region imaging tasks; distributing the N OVT region imaging tasks to a plurality of calculation node groups for migration image, wherein, in each calculation node group, distributing tasks for each calculation node in the groups according to the processing capacity of each calculation node, and in each calculation node, performing task application of the CPU and the GPU according to the processing capacities of the CPU and the GPU. The problem is solved that the calculation time consumption is long in current pre-stack migration imaging, and the technical effect is reached that the pre-stack time migration is simply and effectively completed.
Description
technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a pre-stack time migration method and device. Background technique [0002] Prestack time migration technology is one of the seismic data processing technologies, it can provide the most accurate seismic structure imaging data visible in the time domain, and it plays a very important role in the discovery of large-scale oil fields. [0003] As seismic exploration is entering the era of PB-level data, the processing cycle of seismic data is getting longer and longer. Among them, pre-stack time migration is the most time-consuming link in seismic data processing, which generally takes about 40% of the entire processing cycle. time. [0004] However, if you want to shorten the processing cycle to improve the calculation efficiency of prestack time migration, it is obviously inappropriate to only increase the number of CPU cores and computing nodes. [0005] For the abo...
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IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 王狮虎赵长海薛贵仁王成祥张建磊崔全顺
Owner BC P INC CHINA NAT PETROLEUM CORP